When assigning a random transition to an animated .png sequence that is set to loop, and set the constrain element coordinates within a confined area, in interact mode, the element at first does not constrain itself to the set coordinates, it jumps outside of them and may even go off the canvas, it then corrects itself and obeys the coordinates. So animated element appears to jump off screen and then goes where you want it to be. Please try to fix this as random behavior is a great feature, but this bug may annoy end users. Thanks!
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